有个饼状图，water heater占20%的总电量，
The electricity used by the water heater was measured separately and its cost per kilowatt-hour was one-half the cost per kilowatt-hour of the rest of the electricity used. The cost of the electricity used by the water heater was most nearly what fraction of the total cost of all the electricity used？
请问应该怎么做？
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发表于 2013-11-10 12:38:40
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